Improvement of the Induction Heating Process by Numerical Simulation for the Semi-finished Products

In the paper we present the numericalsimulation of the electromagnetic phenomena coupledwith the thermal ones when processing the semifinishedproducts made up of non-ferrous alloy,through electromagnetic induction with the purpose toobtain a homogenous heating of the pieces in theshortest time. Maxwell’s equations that describe theheating process through induction, show that theimportant quantity, basically important to determinethe eddy currents induced in the piece, is the intensityof the magnetic field, resulting the electromagneticlosses, due to their transformation in thermal energy.Determining these losses and verifying the quantity ofheat emerged in the piece is also possible by means ofmathematical calculus with the help the numericalmodeling by methods of approximation such as themethod of the finite differences or the finite elementmethod. So far the results of the experiments haveshow that the intensity of the magnetic field for a longinductor is more intense in the center of the inductorand weaker at its extremes. The purpose of thenumerical modeling is to render solution tohomogenize the intensity of the magnetic fieldaccording to the geometry of the inductor

About Solar Radiation Intensity Measurements and Data Processing

Measuring the intensity of solar radiation is one of the directions of investigation necessary for the implementation of photovoltaic systems in a particular geographical area. This can be done by using specific measuring equipment (pyranometer) sensors based onthermal or photovoltaic principle. In this paper it is presented a method for measuring solar radiation (which has two main components - direct radiation and diffuse radiation) with sensors based on photovoltaic principle. Such data are processed for positioning solarpanels, in order their efficiency to be maximized

About Eddy Currents in Induction Melting Processes

In this paper we present a method forcomputing the eddy currents in induction meltingprocesses for non-ferrous alloys. We take intoconsideration the situation when only the crucible ismoving, inside the coils. This fact makes differentialcomputation methods to be hard to apply, because isnecessary to generate a new mesh and a new systemmatrix for every for every new position of the cruciblerelated to the coils. Integral methods cancel thisdrawback because the mesh is generated only for thedomains with eddy currents. For integral methods, themesh and the inductance matrix remain unchangedduring the movement of the crucible; only the free termsof the equation system will change